The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2008
Filed:
Feb. 02, 2005
Koji Yoshida, Nara, JP;
Mitsuhiro Matsuo, Osaka, JP;
Yoshihiro Takeshima, Mie, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Provided is a switching power supply unit which uses a multilayer board or a stack of planar conductors as the windings of transformers so as to reduce the volume of the transformers and to have high efficiency, small size and small noise. The switching power supply unit is formed by connecting a plurality of capacitors (), (), () and () connected in series with each other to input terminals () and () of a plurality of switching power supplies having switching elements (), (), () and (), transformers () and (), and rectifiers (), (), () and (). The switching power supply unit inputs the voltages of capacitors ()-(), and outputs the respective voltages developed by the plurality of switching power supplies together to common output terminals () and (). The transformers () and () are each composed of windings made up of a stack of planar conductor coils. This structure can reduce noise transmission through the windings, thereby providing stable output characteristics.